The last.fm scrobler is a great addition to the other scrobbling tools I use. It is unique in that it lets me catalogue my plays on YouTube. I was missing so many songs since I wasn't able to record my music plays. Now, they are all neatly listed on my user page on the last.fm web page. No longer do I have to flip through my YouTube history attempting to find a song I played - most of the time, I simply gave up and moved on. But with this extension, I'm able to determine what I played, when and how many times. Exceptional! I've been a last.fm subscriber since 2011,and I'm glad I found their online scrobbler extension for Firefox Android!